Improvement in bobbins for sewing-machine shuttles



w. H; THAYER.

Bobbins for Sewing'Machine Sh'u tt'les.

N0. 136,282, 4 PatentedFeb.25,1873.

I Fay, I.

PATENT OFFICE.

WVILLIAM H. THAYER, OF SOMERVILLE ,ASSIGNOR TO ABNER J. TOWER, OF

BOSTON, AND OSBORN M. SOUTHWIOK, OF SOME'RVILLE, MASS.

IMPROVEMENT IN BOBBINS FOR SEWING-MACHINE SHUTTLES.

Specification forming part of Letters Patent N0.',l36,282, dated February 25, 1873.

To all whom it may concern.-

Be it known that 1, WILLIAM H. THAYER, of Somerville, of the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Bobbins for the Shuttles of Sewing-Machines and I do hereby declare the same to be fully described in the following specification and represented in the accompanying drawing, of which- Figure 1 is a front elevation,/'and Fig. 2 a longitudinal section, of a bobbin provided with my invention; the object of which is to prevent the thread from being drawn across the circumference of the bobbin-head, and caught and wound about the bobbin-pivot next to the said head. This accident is very liable to happen while the bobbin may be in use or a sewing-machine is in operation, in which case the thread will not be properly delivered from the bobbin, and other difficulties are likely to be experienced.

In carrying out my invention, I combine with each head of the bobbin an auxiliary head, which I prefer to have in the shape of a conic frustum.

In the drawing, a denotes the body or shank, b b the two heads, and c o the two pivots of the bobbin. Between the two heads I) b, and next to each, is an auxiliary head, (I, which is represented in the drawing as a conic frustum, having its lesser base in contact with the head b. Each main head I) and the auxiliary head cl next to it may be, and better be, formed of one piece of metal grooved circumferentially.

In the operation of a bobbin made or provided with auxiliary heads arranged with the main heads, as described, should the thread ride over the edge of the auxiliary head, such thread will fall into the groove or space between the two heads, and the main head will prevent the thread from passing over and bein g wound upon the pivot-the winding of the thread on the pivot being generally due to the momentum generated in the bobbin at the time of stoppage of the shuttle. On again drawing the thread it, by the auxiliary or conical head, will be directed out of the groove, so as to fall back into place with the mass of thread wound upon the body or shank.

I claim- The sewing-machine-shuttle bobbin, provided with the auxiliary heads, as described, arranged with the main heads, shank or body, and pivots, all substantially as specified.

' WM. H. THAYER.

Witnesses R. H. EDDY, J. R. SNOW. 

